Manufacture of orthonitrobenzaldehyde.



UNITED STATES PATNT oEEroE JosEPH KOETSCHET, OF LYON, AND ANDRE BAR-BIKER, or sit. FONS, NEAR LYON,

FRANCE, ASSIGNOIRS TO sooIE'rE CHIMIQUE DES UsINEs Du nHoNE, ANCIENNE- MENT GILLIARD, P. MONNET ET CAR-TIER, or rams, FRANCE, A CORPORATION 01 MANUFACTURE OF ORTHONITROBENZALDEHYDEQ Patented July 11, 1911.

FRANCE.

997,301. Specification of Letters Patent.

No Drawing.

solutions of the salts of nitro-phenyl-nitro' methane, the. formation of nitro-benzaldehyde takes place smoothly. If care is taken that the reaction liquid remains always neutral or only Very weakly alkaline, it is possible to obtain almost theoretical yields. This is the more remarkable, as oxidation with permanganate usually yields only acids and no aldehydes.

Example: A dilute solution of QOl grams of the sodium salt of ortho-nitrophenyl nitromethane in 2000 cc. water is mixed at a low temperature with a cold solution of 105 grams permanganate of potassium (theoretical proportion) in 3000 cc. of water, and thoroughly stirred The format-ion of ortho-nitrobenzaldehyde occurs almost immediately, in accordance with the formula:

Application filed October 7, 1910.

Serial No. 585,774.

Still better yields can be obtained by adding to the permanganate solution such a quantity of magnesium 1' sulfate that the detrimentally acting alkali liberated is replaced by magnesia, which has no injurious action. Instead of magnesium sulfate. other salts giving a similar result may be employed.

lVhat we claim-and desire to secure by Letters Patent is 1.. A process for the manufacture of orthonitrobenzaldehyde, comprising treatment of a neutral or approximately neutral solution of a salt of ortho-nitrophenyhnitromethane with a permanganate.

2. A process for the manufacture of orthonitrobeny aldehyde, comprising treatment of a neutral or approximately neutral solution of a salt of ortho-nitrophenyl-nitromethane with a permanganate, in presence of a substance capable of reacting with liberated alkali to prevent detrimental action thereof.

3. A process for the manufacture of orthoiitrobenzaldehyde comprising treatment of a neutral or'approximately neutral solution of a salt of ortho-nitrophenyl-nitromethane with a permanganate, in presence of mag nesium sulfate, substantially as described.

4. A process for the manufacture of orthonitrobenzaldehydefcomprising treatment of a neutral or'approximately neutral solution of sodium salt of ortho-nitro-phenylnitro methane with a permanganate, in presence of magnesium. sulfate, substantially as described.

In witness whereof, we have hereunto signed our names in the presence of two subscribing witnesses.

JOSEPH KOETSCHET. ANDRE BARRIER.

lVitnesses 7. E. lVATTs, GUILLoT CLAUDE. 

